Watchman&#39;s locking apparatus.



INO.'838,408. I PATENTED DEC. 11, 190 6.

H. HINDERSIN.

WATCHMANS LOCKING APPARATUS.

APPLIGATION FILED 1m n. 1905.

3 SHEETESHEET 1.

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No..ss8,40a. PATENTED DEC. 11, 1906.

- H. HINDERSIN.

WATGHMANS LOCKING APPARATUS.

APPLICATION FILED JAN.17. 1905,

3 SHEETS -SHBBT 2.

No. 838,408- PATENTED DEC. 11. 1906,

' H. HINDERSIN.

WATGHMAN'S LOCKING APPARATUS.

APPLICATION FILED JAN.17. 1905.

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' UNITED STATES PATENT OFFICE.

WATCHMANS LOCKING APPARATUS.

Specification of Letters Patent.

Patented Dec. 11, 1906.

Application fil d January 17, 1905. Serial No. 241.472.

To all whmn it may concern:

Be it known that I, Hons'r HINDERsIN, a subject of the German Emperor, residing at Berlin, Germany, have invented certain new and useful Improvements in Looking Apparatus for Watchmens Electric Controls and the Like, of which the following is a specifica tion.

This invention relates to improvements in looking apparatus for watchmens electric controls and the like.

An essential feature of controlling devices for watchmen and the like is that the manipulation thereof for the purpose of producing in accurate indications should be impossible. Methods frequently used for the purpose of producing inaccurate indications consist, for instance, in incompletely winding up the clockwork mechanism or in overwinding same by turning the key through more than three hundred and sixty degrees.

The object of the present invention is to prevent interference with controlling devices by the methods indicated. For this purpose I use a special key in combination with a spring-actuated ring, the arrangement being such that the clockwork mechanism is not unlocked until the key has been turned through exactly three hundred and sixty degrees and withdrawn from the controlling device.

The invention is illustrated by way of example in the annexed drawings, in which Figure 1 is an elevation of the improved apparatus. Fig. 2 is a plan view thereof. Fig. 3, a vertical section; Fig. 4, a sectional plan view with the parts in different positions to those represented in Fig. 2. Fig. 5 is a detail of construction. Figs. 6 to 8 show other details in three consecutive positions of the parts.

Referring to the drawings, 1 represents a key provided with a projection 2, adapted to pass through a longitudinal slot 3 in a socket 5, fixed to the cover 4 of the controlling device. The pin 6, engaged by the said key, is adapted to wind up the mainspring in the spring-case 7, and during the rotation of the key the projection 2 extends beyond the lower edge of the socket 5, and thus prevents the withdrawal of the key until a complete revolution has been made. Shortly before the termination of the said revolution of the key a projection8, extending laterally from the pin 6, pushes aside a spring-pressed arm 10, pivoted at 9, so that a finger 11, depending from said arm, is disengaged from a recess 12 in the circumference of a spring-actuated ring 17. The latter is rotatable on a toothed wheel 14, operated by the clockwork 40 but the rotary movement of the ring on the wheel is limited by means of slots 15 and screws 16, fixed to said toothed wheel 14. When the finger 1 1 is disengaged from the recess 12, the ring 17 rotates under the action of the spring 13, the finger 11 bearing against the circumference of the ring. During the further rotation of the key the head 18 of the projection 8, Fig. 5, enters a recess 19 in the hook-shaped end 20 of the arm 10, so that the said proje'c tion prevents further rotation of the pin 6, and consequently, also, of the key 1. After the running down of the wheel 14 and the contact-disk 21, connected therewith, the finger 11 again engages into the recess in the ring 17, and a notch 22 in the end of the projection 8 is in such a position with regard to the end 20 of the arm 10 that the said projection 8 can again pass under the said end 20.

The insertion of the key during the running down of the driving-wheel is prevented by the following means: On the movement of the ring 17, which occurs on the disengagement ofthe arm 10, a pin 23 on the ring 17, previously in theposition shown in Fig. 6, trips an arm 25, which is acted on by a spring 24 and is rotatable on a pivot 26. Another arm 27, mounted on the same pivot 26 and movable with the arm 25, is connected to a slide 29 by means of a slot 28 in the arm 27 and pin 34 on said slide, so that the latter is moved on the cover 4 to bring the bifurcated end 30, Fig. 6, against the key, as shown in Fig. 7. After the removal of the key the slide 29 is forced farther forward by the spring 24, so that its said end 30 is pressed against the winding-pin 6 (see Fig. 8) and the removed key cannot again be inserted during the running down of the clockwork. Shortly before the end of one revolution of the toothed wheel 14 a pin 31,fixed to the latter, Figs. 4 to 8, moves the arm 25 back into its initial position, in which it is held by the pin 23 on the ring 17.

In order that the clockwork will only be started when the key has been removed, the fly 32 is engaged by a resilient double-armed lever 36, Figs. 2 to 4, pivoted at 33 and held in looking position by a spring. The pin 34 on the slide 29 projects behind the one arm of the lever 36, and when. the second part of the movement of the slide 29 takes place on removal of the key 1 the pin 34 moves the lever 36 about its pivot 33 and releases the fly 32.

In order that the relocking of the clockwork does not take place until after complete revolution of the contact-disk 21, the lever 36 is held out of locking position by a pin 35 on the wheel 14, riding behind the tail of the lever 36, while the parts 25, 27, and 29 are being restored to their initial position, as in Fig. 6, and the fly 32 is not checked until the finger 11 has entered the groove 12, at which moment the pin 35 on the toothed wheel 14 passes the end lever 36 (see Fig. 2) and allows the latter to reengage the fly.

The arrangement described compels the watchman to remove the key after turning it through exactly three hundred and sixty degrees in order to allow the clockwork to run down. Tampering with the working of the controlling device is thus rendered impossible.

I claim- 1. In a watchmans electrical control the combination with a clockwork and a removable key for winding the same, of means adapted to be set by the key during its winding movement in such position to operate to unlock the clockwork upon the withdrawal of the key.

2. In a watchmans electrical control the combination with a clockwork, a removable key for winding the same, means for locking the clockwork and means operated by the key during its winding movement to displace the locking device into contact with the key, and means for further movement of the locking device to release the clockwork upon the withdrawal of the key.

3. In a watchmans electrical control the combination with a clockwork a contact device coacting therewith and a key for winding said clockwork of means for preventing the withdrawal of the key until a complete revolution thereof has been made, means for preventing the rotation of the said key beyond such complete revolution, means for preventing the reinsertion of said key after its withdrawal and means for unlocking the clockwork after such withdrawal substantially as described.

4. In a watchmans electrical control the combinati on with a clockwork, a contact device coacting therewith and a key for winding said clockwork of means for preventing the rotation of the key beyond a complete revolution comprising a winding-pin operated by the key, a rotatable spring-actuated ring having a recess in its periphery, a springpressed arm having a recess in its end, a finger on said arm adapted to engage the recess in the ring to normally look same and a lateral projection on said winding-pin adapted to deflect said arm to release the ring and subsequently engage the recess in the arm to lock the windingpin substantially as described.

5. In a watchmans electrical control the combination with a clockwork, a contact device coacting therewith and a key for winding said clockwork of means for preventing the reinsertion of said key after its removal comprising a winding-pin operated by the key, a rotatable spring-actuated ring, a pin flxed to said ring, a spring-actuated arm. adapted to be deflected by said pin, a slide coacting with said arm to be pressed against said winding-pin and prevent insertion of the key and means for returning said slide to its original position substantially as described.

6. In a watchmans electrical control the combination with a clockwork, a contact device coacting therewith and a key for winding said clockwork of means for preventing the reinsertion of said key after its removal comprising a winding-pin operated by the key, a rotatable spring-actuatcd ring, a pin fixed to said ring, a spring-actuated arm adapted to be deflected by said pin, a slide coacting with said arm to be pressed against said winding-pin and prevent insertion of the key, means for returning said slide to its original position, means for starting the clockwork after withdrawal of the key comprising a locking device for said clockwork, a doublearmed lever normally engaging said device and a pin on the aforesaid slide adapted to disengage said lever 011 movement of the slide and means for causing said lever to reengage the locking device substantially as described.

In witness whereof I have hereunto signed my name, this 23d day of December, 1904, in the presence of two subscribing witnesses.

HORST IIINDERSIN.

I/Vitnesses:

HENRY HAsrER, VVOLDEMAR HAUPT. 

